(Cat? OR feline) AND NOT dog?
Cat? W/5 behavior
(Cat? OR feline) AND traits
Cat AND charact*

This guide provides a more detailed description of the syntax that is supported along with examples.

This search box also supports the look-up of an IP.com Digital Signature (also referred to as Fingerprint); enter the 72-, 48-, or 32-character code to retrieve details of the associated file or submission.

Concept Search - What can I type?

For a concept search, you can enter phrases, sentences, or full paragraphs in English. For example, copy and paste the abstract of a patent application or paragraphs from an article.

Concept search eliminates the need for complex Boolean syntax to inform retrieval. Our Semantic Gist engine uses advanced cognitive semantic analysis to extract the meaning of data. This reduces the chances of missing valuable information, that may result from traditional keyword searching.

Publishing Venue

Related People

Abstract

This article describes an Auto-Selective Serial Interface circuit which can select RS-232 interface or RS-422 interface automatically by sensing and monitoring a signal level of each line. This circuit enables automatic interface switching between each interface without operating a mechanical switch or mechanical connection change.

Country

United States

Language

English (United States)

This text was extracted from an ASCII text file.

This is the abbreviated version, containing approximately
81% of the total text.

Auto Selective Serial Interface

This article
describes an Auto-Selective Serial Interface
circuit which can select RS-232 interface or RS-422 interface
automatically by sensing and monitoring a signal level of each line.
This circuit enables automatic interface switching between each
interface without operating a mechanical switch or mechanical
connection change.

The Figure
shows the concept of this circuit. The
RS-232
signal level has "Space" state (up +2 volts) or "Mark"
state (under
-2 volts). When the RS-232 serial
interface is connected, the
RxD(Receive Data) signal line on the interface is in the Mark state
when there is no communication, and it has one Mark state at least in
every one data frame when communicating.
So by sensing this RxD
signal level, the connected serial interface can be judged whether it
is connected to the RS-232 interface or the RS-422 interface.

Level Sense
circuit (1) detects whether the RxD signal is in
the Mark state (under -2 volts) or not.
The Delay Circuit or Timer
circuit (2) is needed for judgment when communicating. As described
above, RxD signal has one Mark state at least in every one data frame
when communicating. So the RxD signal
must be monitored whether it
has one Mark state during one data frame span.
This circuit (2) is
used for this function. SW (3) is a
switch which is used for
selecting receive data from either RS-232 or RS-422. When the RS-232
interface is connected, the rec...